mass fragmentation

[mk12]

I am working on compound aloesone. Its moelcuar wt is 232 and give daugher ion 190 and 161...can somebody help how is fragmented..i can not paste struct here but following link has pdf paper which has structure

http://www.google.com/search?hl=en&clie ... rt=10&sa=N (fifth result)

[analchem]

What ionization are you using? EI? CI, positive or negative? This is all relevant to interpretation.